Package Exports

estree-util-value-to-estree

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Readme

estree-util-value-to-estree

Convert a JavaScript value to an estree expression

Installation

npm install estree-util-value-to-estree

Usage

This package converts a JavaScript value to an estree for values that can be constructed without the need for a context.

Currently the following types are supported:

arrays
bigints
booleans
dates
null
numbers (including Infinity, NaN, and negative numbers)
objects (plain objects only)
regular expressions
strings
symbols (only global symbols)
typed arrays (Float32Array, Float64Array, Uint8Array, Uint8ClampedArray, Uint16Array, andUint32Array)
undefined
URL objects
URLSearchParams objects

import { deepEqual } from 'assert';

import { valueToEstree } from 'estree-util-value-to-estree';

const result = valueToEstree({
  null: null,
  undefined,
  string: 'Hello world!',
  number: 42,
  negativeNumber: -1337,
  infinity: Number.POSITIVE_INFINITY,
  notANumber: Number.NaN,
  regex: /\w+/i,
  date: new Date('1970-01-01'),
  array: ['I’m an array item!'],
  object: { nested: 'value' },
});

deepEqual(result, {
  type: 'ObjectExpression',
  properties: [
    {
      type: 'Property',
      method: false,
      shorthand: false,
      computed: false,
      kind: 'init',
      key: { type: 'Literal', value: 'null', raw: '"null"' },
      value: { type: 'Literal', value: null, raw: 'null' },
    },
    {
      type: 'Property',
      method: false,
      shorthand: false,
      computed: false,
      kind: 'init',
      key: { type: 'Literal', value: 'undefined', raw: '"undefined"' },
      value: { type: 'Identifier', name: 'undefined' },
    },
    {
      type: 'Property',
      method: false,
      shorthand: false,
      computed: false,
      kind: 'init',
      key: { type: 'Literal', value: 'string', raw: '"string"' },
      value: { type: 'Literal', value: 'Hello world!', raw: '"Hello world!"' },
    },
    {
      type: 'Property',
      method: false,
      shorthand: false,
      computed: false,
      kind: 'init',
      key: { type: 'Literal', value: 'number', raw: '"number"' },
      value: { type: 'Literal', value: 42, raw: '42' },
    },
    {
      type: 'Property',
      method: false,
      shorthand: false,
      computed: false,
      kind: 'init',
      key: {
        type: 'Literal',
        value: 'negativeNumber',
        raw: '"negativeNumber"',
      },
      value: {
        type: 'UnaryExpression',
        operator: '-',
        prefix: true,
        argument: { type: 'Literal', value: 1337, raw: '1337' },
      },
    },
    {
      type: 'Property',
      method: false,
      shorthand: false,
      computed: false,
      kind: 'init',
      key: { type: 'Literal', value: 'infinity', raw: '"infinity"' },
      value: { type: 'Identifier', name: 'Infinity' },
    },
    {
      type: 'Property',
      method: false,
      shorthand: false,
      computed: false,
      kind: 'init',
      key: { type: 'Literal', value: 'notANumber', raw: '"notANumber"' },
      value: { type: 'Identifier', name: 'NaN' },
    },
    {
      type: 'Property',
      method: false,
      shorthand: false,
      computed: false,
      kind: 'init',
      key: { type: 'Literal', value: 'regex', raw: '"regex"' },
      value: {
        type: 'Literal',
        value: /\w+/i,
        raw: '/\\w+/i',
        regex: { pattern: '\\w+', flags: 'i' },
      },
    },
    {
      type: 'Property',
      method: false,
      shorthand: false,
      computed: false,
      kind: 'init',
      key: { type: 'Literal', value: 'date', raw: '"date"' },
      value: {
        type: 'NewExpression',
        callee: { type: 'Identifier', name: 'Date' },
        arguments: [{ type: 'Literal', value: 0, raw: '0' }],
      },
    },
    {
      type: 'Property',
      method: false,
      shorthand: false,
      computed: false,
      kind: 'init',
      key: { type: 'Literal', value: 'array', raw: '"array"' },
      value: {
        type: 'ArrayExpression',
        elements: [
          {
            type: 'Literal',
            value: 'I’m an array item!',
            raw: '"I’m an array item!"',
          },
        ],
      },
    },
    {
      type: 'Property',
      method: false,
      shorthand: false,
      computed: false,
      kind: 'init',
      key: { type: 'Literal', value: 'object', raw: '"object"' },
      value: {
        type: 'ObjectExpression',
        properties: [
          {
            type: 'Property',
            method: false,
            shorthand: false,
            computed: false,
            kind: 'init',
            key: { type: 'Literal', value: 'nested', raw: '"nested"' },
            value: { type: 'Literal', value: 'value', raw: '"value"' },
          },
        ],
      },
    },
  ],
});